First could someone verify that all three ISDN BRI channels (2B + 1D) use TDM? If so when sending packets from an ISDN BRI line using TDM to a frame relay network would the transmission be full or half duplex? Thanks for the responses of my last question about if TDM is full or half duplex. Thanks, Jeff Lodwick MCSE/CCNA _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. _________________________________ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]